(Equivalent Tests: IP 310 and AFNOR T60-140)
EXPLANATION
See discussion under Test Method D217. The current method is intended for use only when the size of the sample is limited. Precision is better in the full scale method.
These test methods include procedures for the measurement of unworked and worked penetrations. Unworked penetrations do not generally represent the consistency of greases in use as effectively as do worked penetrations. The latter are usually preferred for inspecting lubricating greases.
TEST SUMMARY
There are two test procedures, one for one-fourth scale cone and the other for the half scale cone. The penetration is determined at 25° C (77° F) by releasing the cone assembly from the penetrometer and allowing the cone to drop freely into the grease for 5 s.
TEST PRECISION
